If you buy in bulk, weigh and divide the meat into portions when you return home.
A vacuum sealer is a great investment, as you can freeze the portions, and take out what you need for an upcoming meal.
Zipper bags are also great, but don't last as long as the vacuum sealed ones.
You could do the same with frozen veggies, too, if you wish.
Another option is to make a full meal (Shepherd's pie, stew, meatloaf, etc.), divide it into portions, and freeze in containers (or vacuum seal it), and you'd have your own "frozen dinner" at hand, without all the added chemicals - and it would be items of your choosing.